Do what you love. Know your own bone; gnaw at it, bury it, unearth it, and gnaw it still.
Source: In Best Quotations for All Occasions, by Lewis C. Henry, 1945.
-- Henry David Thoreau, (Jul 12 1817-1862), US essayist, poet, naturalist; He is best known for his description of life at Walden Pond, Walden, 1854 and his essay Civil Disobedience, 1849.